Experimental Study On The Enrichment Of Noble Metals In PCB By The Process Of Pyrometallurgy

Production prediction of electronic waste in China is made on the basis of statistics of electric and electronic appliances manufactured and consumed in China. It concluded that electronic waste in China is now experiencing high growth. The factors which influence on China electronic waste production and management are listed as follows: Global Environment, Technological Advances, Consumers' concept, and Growing of Spending Power. The electronic waste has the character of both grievous pollution and high value to be recycled. This character caused an uneconomical recycle developed quickly. Correspondingly, the pollution becomes "bottle neck" effects on its recycling. It becomes significance to develop an economy and environment friendly technology for the disposition of electronic waste. The practical experience of traditional noble-metal-metallurgy makes it sure that the economic method of enrichment of noble metal in refined ore is pyrometallurgy. This research is reference to the experience of copper smelt, and uses pyrometallurgy in disposing PCB and enriching the noble metal in PCB. Due to the character of waste electronic scraps and referred to the practical experience of noble metal metallurgy, a process is designed to dispose PCB which mixed pollution harness, metal recover and enrichment of noble metals. A suit of experiment is done to answer some questions in operation of this process. The main purpose of these experiments is to improve the reclaimed ratio of metal and the efficiency of pollution removal. This research is carried out according to the process and compartmentalized to three main phases correspondingly. The outcome of the research list as follows:1. Using NaOH as slag-make-stuff can separate metal with slag. 18g NaOH is needed to melt 100g rudiment of pyrogenation in the temperature 600℃. And that is to say 12g NaOH is needed for separating metal with slag. The reclaimed ratio is more than 94%. The highest one is amount to 99.8%.2. The reclaimed ratio can not meet with the purpose without using slag-make-stuff. When slag from metal separation is used as slag-make-stuff, the...